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  • Hotronic - Footwarmer S4 Universal - One Color

Hotronic Footwarmer S4 Universal


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    • One Color, One Size


    8 Reviews


    Warms up any shoe or boot.

    Hotronic's Footwarmer S4 Universal electronic boot warmers give a boost of warmth to ski boots, snow boots, and any shoe, really. You can cut the Heat Ready insole to fit any footwear in your closet, and the Heating Elements stick to the toes or heels for warmth where you want it most. The battery packs provide nearly a day's worth of warmth, and the recharger readies the batteries for the next day. Self-adhesive covers and strips make the setup easy and quick so you can maintain toasty toes all winter long.

    • Heat-Ready insoles
    • Heating Elements
    • Battery packs and recharger
    • Self-adhesive covers and strips
    • Item #HOT0002

    Tech Specs

    Battery Type
    Battery Life
    [1] 16.5 - 21 hours, [2] 7 - 10.5 hours, [3] 5 - 7.5 hours, [4] 2.5 - 4.5 hours
    Recommended Use
    skiing, snowboarding

    Tech Specs

    • Reviews
    • Q & A

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    I wish I bought these sooner!

      I've left the resort way too early due to cold feet and hands. Thanks to my new Hottonic footwarmers I'm inclined to spend a full day on the mountain. I had my boot fitter install these on my custom insoles. I highly recommend .

      So Crucial to a Good Day

        I have had too many ski days to count cut short by cold toes. But this system keeps me out longer, getting more turns and making me happier throughout the day! I am in a much better mood when I have my batteries plugged in, which has led to better ski days!

        Hotronic Footwarmer

        • Familiarity: I've put it through the wringer

        These foot warmers were game changers for me. Took me about 5 min each boot to install. There is a YouTube video that walks you step by step through it. Love them my feet always get cold, and these have made a huge, huge difference in my ability to stay out and ski. My only regret is not buying them sooner.

        Tricky to install but worth it

        • Familiarity: I've put it through the wringer

        These are great! Have totally changed skiing for me and my feet are always warm and don't hurt anymore! Would definitely recommend them

        break easily

        • Familiarity: I've used it several times

        The heating element cables break easily. My husband and I know they are fragile and have each gone through 2 elements this season alone. This is an old problem that has not been fixed. The element does not work well with custom insoles as it is a hard metal plate under the ball of your foot. The battery packs are improved and last all day.

        Nice warm feet but...

        • Familiarity: I've used it several times

        It is nice to have warm feet, but the placement of the heat element green oval compromises the fit of my custom insoles and by noon on a powder day I had to quit because the pads of my feet hurt so bad... but they were warm. Also this is a very invasive process to instal these heaters. You have to cut a 2cm hole in your insoles, then cut a hold in your liners and if you have fancy custom molded liners they certainly do not fit like they did before you had to thread the bulky 2cm-wide wire through the center of them.

        Happy wife, Happy life.

        • Familiarity: I've used it several times

        I got these for my wife who chronically complains of cold feet when we are skiing. She hasn’t complained since she started skiing with these. Could Hotronics be the answer to a happy marriage? If cold feet are involved then YES!

        Hotronic Foot Warmers

        • Familiarity: I've put it through the wringer

        Love the product bought it for my daughter and she skis more because her feet which are always cold are warmer now. Only issue is that the battery location seems to get caught on lift and break off or severs the cord if positioned on back of the boot. Ski pants gators over boots held battery so the battery was not lost. With her boots the side location does not work because of power strap. So now I got longer cord and I run cord up her ski pants and put battery in her pocket. Batteries are very expensive to replace if lost. Batteries still working after two years of skiing.